Adaptive coupling of smooth particle hydrodynamics and finite-element method for rock blasting simulations

2016 ◽  
pp. 269-274
Author(s):  
D Deb ◽  
A Khan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Rock Blasting ◽  
Smooth Particle Hydrodynamics ◽  
Particle Hydrodynamics ◽  
Adaptive Coupling ◽  
Element Method

scholarly journals Study on Numerical Simulation Methods for Hypervelocity Impact on Large-Scale Complex Spacecraft Structures

Aerospace ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 12
Author(s):  
Yanxi Zhang ◽  
Fengjiang An ◽  
Shasha Liao ◽  
Cheng Wu ◽  
Jian Liu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Large Scale ◽  
Hypervelocity Impact ◽  
Coupling Method ◽  
Smooth Particle Hydrodynamics ◽  
Particle Hydrodynamics ◽  
Numerical Simulation Methods ◽  
Element Method

This paper aims to study the difference of results in breakup state judgment, debris cloud and fragment characteristic parameter during hypervelocity impact (HVI) on large-scale complex spacecraft structures by various numerical simulation methods. We compared the results of the test of aluminum projectile impact on an aluminum plate with the simulation results of the smooth particle hydrodynamics (SPH), finite element method (FEM)-smoothed particle Galerkin (SPG) fixed coupling method, node separation method, and finite element method-smooth particle hydrodynamics adaptive coupling method under varying mesh/particle sizes. Then based on the test of the complex simulated satellite under hypervelocity impact of space debris, the most applicable algorithm was selected and used to verify the accuracy of the calculation results. It was found that the finite element method-smooth particle hydrodynamics adaptive coupling method has lower mesh sensitivity in displaying the contour of the debris cloud and calculating its characteristic parameters, making it more suitable for the full-scale numerical simulation of hypervelocity impact. Moreover, this algorithm can simulate the macro breakup state of the full-scale model with complex structure and output debris fragments with clear boundaries and accurate shapes. This study provides numerical simulation method options for the follow-up research on breakup conditions, damage effects, debris clouds, and fragment characteristics of large-scale complex spacecraft.

Smoothed particle hydrodynamics versus finite element method for blast impact

2013 ◽  
Vol 61 (1) ◽  
pp. 111-121 ◽  
Author(s):  
T. Jankowiak ◽  
T. Łodygowski
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Smoothed Particle Hydrodynamics ◽  
Concrete Slab ◽  
The Finite Element Method ◽  
Particle Hydrodynamics ◽  
Mesh Density ◽  
Smoothed Particle ◽  
Element Method

Abstract The paper considers the failure study of concrete structures loaded by the pressure wave due to detonation of an explosive material. In the paper two numerical methods are used and their efficiency and accuracy are compared. There are the Smoothed Particle Hydrodynamics (SPH) and the Finite Element Method (FEM). The numerical examples take into account the dynamic behaviour of concrete slab or a structure composed of two concrete slabs subjected to the blast impact coming from one side. The influence of reinforcement in the slab (1, 2 or 3 layers) is also presented and compared with a pure concrete one. The influence of mesh density for FEM and the influence of important parameters in SPH like a smoothing length or a particle distance on the quality of the results are discussed in the paper

Design and Numerical Analysis of a Vehicle Armour Against Bullets and Shaped Charges

2015 ◽  
Author(s):  
M. Ömer Kayki ◽  
Nurullah Kayaci ◽  
Kerim Özbeyaz
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Shaped Charge ◽  
Military Force ◽  
Smooth Particle Hydrodynamics ◽  
The Finite Element Method ◽  
Suitable Material ◽  
Military Vehicle ◽  
Particle Hydrodynamics ◽  
Combat Environment

Armored vehicles are used to carry soldiers and machinery in combat environment in safety. As a result of the experience of a military force involved in the missions in combat areas, armoring of military-vehicle should be durable against bullet impacts and shaped charge explosions. These vehicles should provide required protection of soldiers and equipment against penetration and explosion and also have good mobility (moveable capability). In order to achieve this, the vehicle must be lightweight. The most suitable material should be selected and the most suitable geometry should be designed to achieve this goal. In this study; different material combinations and different geometries are simulated using the finite element method and smooth particle hydrodynamics. Different caliber bullets are impacted into armor and their penetration affects are observed. Shaped charge explosive also used. As a result of this simulation, the material combinations are optimized to achieve the best armor.

scholarly journals Study of Numerical Simulation during ECAP Processing of Can Based on Smooth Particle Hydrodynamics

Complexity ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-16
Author(s):  
Xiaofeng Niu ◽  
Chenchen Wang ◽  
K. C. Chan ◽  
Han Wang ◽  
Shidong Feng
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Equivalent Strain ◽  
Smooth Particle Hydrodynamics ◽  
The Finite Element Method ◽  
Sph Method ◽  
Ecap Processing ◽  
Particle Hydrodynamics ◽  
Simulation Results ◽  
Deformation Area

ECAP (Equal Channel Angular Pressing) is a well-known technique by which a specimen is pressed into an ECAP die to improve the mechanical properties by the nearly pure shear during the deformation process. In the ECAP processing of can, the specimen is canned with a protection material layer to avoid the cracking during deformation. At present, most simulation studies of ECAP are conducted based on the finite element method, in which large deformation can cause serious mesh distortion, resulting in a decrease of the simulation accuracy. In this study, based on SPH (Smooth Particle Hydrodynamics), we utilize the invalid particles and crack treatment techniques, building an ECAP mathematical model incorporating damage prediction, in order to simulate crack initiation and dynamic extension in the ECAP process. In simulation of pure magnesium during ECAP at room temperature using industrial pure iron as the canned material, the simulation results based on SPH method show that the plastic deformation of the pure magnesium specimen is homogeneous in both the vertical direction and the extrusion direction. The average equivalent strain value of the specimen in the major deformation area is 1.31, which is similar to the finite element simulation result in which the average equivalent strain value of the major deformation area is 1.24. From the damage perspective, the maximum damage values of the inside specimen obtained by the SPH method and the finite element method are both less than 0.16, with both values being far lower than the critical fracture accumulated damage value. The test results well match the simulation results.

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